Sheave.



Pate'ntad Ian. a, 190i.- B. c. RIBLET.

S E Av E (Application filed Mar. 24, 1900.

(No Model.)

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UNITED STATES PATENT @EEIQE.

BYRON O. RIBLET, OF NELSON, CANADA.

SH EAVE.

SPECIFICATION forming part of Letters Patent No. 665,467, dated January 8, 1901.

Application filed March 24, 1900. Serial No 10,029. (No model.)

To all whom it may concern:

Be it known that I, BYRON C. RIBLET, a citizen of the United States of America, residing at Nelson, district of Kootenai, British 00- lumbia, Canada, have invented certain new and useful Improvements in Sheaves; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertaius to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in sheaves; and the objects of my invention are, first, to provide a sheave especially adapted for wire-rope aerial tramways that will resist the wear of a running rope under the strain and weight of loaded running buckets and moving material, and, second, to provide a built-up sheave having a removable and renewable chilled or white iron treadring. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a side elevation of my improved sheave. Fig. 2 is a cross-section of Fig. 3 on line A. Fig. 3 is a side view of the web of the sheave with one of the side flanges and the oil-cup removed, showing a section of the tread-ring; and Fig. 4 is a sectional view of the web and hub portion of the sheave.

Similar numerals of reference refer to similar parts throughout the several views.

Referring to the drawings, the numeral 1 designates the hub of the sheaveQ In the hub is fitted a bushing 2, preferably of phosphorbronze and graphite. A pin 3 is fitted in the bushing. The free end 3* of the pin is secured in any convenient manner in suitable derricks or supports, which are not shown. A head 4 is formed on the pin, and an oil-cup 5 is threaded over the head of the pin to the adjacent end of the hub. An oil-hole 5 is formed in the cup. 6 designates the web of the sheave. This web is cast integral with the hub. At its periphery it is broadened out, and a semicircular recess 7 is cast in it throughout its circumference. At several points in the circumference of the periphery there are recesses 8, which extend from the just below the periphery. A tread-ring 10,

which I make as hard as it can be made of white or chilled cast-iron, fits centrally on the periphery of the web, and molten babbitt 11 is poured into the side recesses and fills the circumferential grooveup against the treadring, forming a tight-fitting seat for the treadring on the web. The tread 12 of the ring is slightly concaved, and each of the sides 13 and 14 is also concaved. l5 and 16 designate the side flanges of the sheave. They are preferably made of steel and are pressed or stamped into the shape desired. Their central portions are fitted against steps 17, formed in opposite ends of. the hub. These flanges are bolted to the hub and tread-ring by the bolts 18, which pass through the flanges and through the holes 9 in the web,

which are made enough larger than the bolts to allow of adjustment of the web and treadrings.

The peripheries of the flanges are curved outward on preferably the same radius as the curve of the tread of the ring, and they are also each provided with an inward crimp corrugation or curve 19 and 20, adapted to fit in the concaved curves in the sides of the treadring. into the sides of the tread-ring lock it to the flanges and prevent pieces of the ring from flying out in case the ring becomes broken. The white-iron tread-ring being very hard wears a long time and will wear many months longer than a steel tread-ring and more than a year longer than a common gray-iron casting under the severe service they are subjected to on tramways, and when worn too much can be easily removed by removing bolts and flanges and babbitting a new ring onto the periphery of the web.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a wire-rope sheave, the combination with the hub and web, of the removable treadring having a concaved tread and concaved sides and side flanges each provided with a concentric, concaved corrugation adapted to fit into said side concaves of said tread-ring, and means including bolts for removably These curves in the flange projecting clamping said flanges to said hub and treadring, substantially as described.

2. In a wire-rope sheave, the combination of the hub and web, there being a peripheral groove in said web, and a step on each side of said hub, a tread-ring of white iron or other suitable material removably seated on the periphery of said web, a bed of babbitting material in said peripheral groove and between said web and said tread-ring, side flanges removably bolted to said hub and tread-ring and having their peripheries flared outward from said tread-ring, substantially as described.

3. In a wire-rope sheave the combination of the hub having steps and a web, there being a peripheral groove in said web, and side holes in the periphery thereof, the tread-ring A. M. JOHNSON, JAs. OSHEA. 

